WIRE COLLECTION DEVICE WITH GEARED ADVANTAGE

摘要

A stent delivery system includes a wire collection device which is constructed with a thumbwheel coupled to a collection spindle that is rotatable to collect a retraction wire about the collection spindle. A proximal end of an outer stent-constraining sheath is coupled to the collection spindle by the retraction wire and a distal end of the outer sheath retractably surrounds a distally-disposed self-expanding stent. The wire collection device includes a first set of gears at a higher gear ratio and a second set of gears at a lower gear ratio. Stent deployment speed may be controlled or varied by switching or alternating between engaging the first of gears and the second set of gears, thereby accommodating changing resistance as the outer sheath is retracted and releases binding force of the stent.

主权项

1. A stent deployment system, including a wire collection device comprising:
a collection spindle rotatable to collect a retraction wire around the collection spindle, the retraction wire coupled to an outer sheath retractable to deploy a stent; a first driven gear and a second driven gear mounted along the collection spindle, a radius of the second driven gear being greater than a radius of the first driven gear; a thumbwheel mounted on a wheel axle substantially parallel to the collection spindle, the thumbwheel rotatable and disposed in mechanical communication with the wheel axle to actuate rotation of the wheel axle; a first actuating gear and a second actuating gear, the first actuating gear sized to engage the first driven gear to collect the retraction wire at a first speed and the second actuating gear sized to engage the second driven gear to collect the retraction wire at a second speed greater than the first speed.